* by the Free Software Foundation.
*/
-#include <crypto/algapi.h>
#include <crypto/gf128mul.h>
+#include <crypto/internal/aead.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/scatterwalk.h>
+#include <linux/completion.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
-#include "scatterwalk.h"
-
struct gcm_instance_ctx {
- struct crypto_spawn ctr;
+ struct crypto_skcipher_spawn ctr;
};
struct crypto_gcm_ctx {
struct gf128mul_4k *gf128;
};
+struct crypto_rfc4106_ctx {
+ struct crypto_aead *child;
+ u8 nonce[4];
+};
+
struct crypto_gcm_ghash_ctx {
u32 bytes;
u32 flags;
struct crypto_gcm_req_priv_ctx {
u8 auth_tag[16];
u8 iauth_tag[16];
- u8 counter[16];
+ struct scatterlist src[2];
+ struct scatterlist dst[2];
struct crypto_gcm_ghash_ctx ghash;
+ struct ablkcipher_request abreq;
+};
+
+struct crypto_gcm_setkey_result {
+ int err;
+ struct completion completion;
};
+static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
+ struct aead_request *req)
+{
+ unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
+
+ return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
+}
+
static void crypto_gcm_ghash_init(struct crypto_gcm_ghash_ctx *ctx, u32 flags,
struct gf128mul_4k *gf128)
{
n = scatterwalk_clamp(&walk, len);
if (!n) {
- scatterwalk_start(&walk, sg_next(walk.sg));
+ scatterwalk_start(&walk, scatterwalk_sg_next(walk.sg));
n = scatterwalk_clamp(&walk, len);
}
crypto_xor(dst, buf, 16);
}
-static inline void crypto_gcm_set_counter(u8 *counterblock, u32 value)
-{
- *((u32 *)&counterblock[12]) = cpu_to_be32(value);
-}
-
-static int crypto_gcm_encrypt_counter(struct crypto_aead *aead, u8 *block,
- u32 value, const u8 *iv)
+static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
{
- struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
- struct crypto_ablkcipher *ctr = ctx->ctr;
- struct ablkcipher_request req;
- struct scatterlist sg;
- u8 counterblock[16];
+ struct crypto_gcm_setkey_result *result = req->data;
- if (iv == NULL)
- memset(counterblock, 0, 12);
- else
- memcpy(counterblock, iv, 12);
-
- crypto_gcm_set_counter(counterblock, value);
+ if (err == -EINPROGRESS)
+ return;
- sg_init_one(&sg, block, 16);
- ablkcipher_request_set_tfm(&req, ctr);
- ablkcipher_request_set_crypt(&req, &sg, &sg, 16, counterblock);
- ablkcipher_request_set_callback(&req, 0, NULL, NULL);
- memset(block, 0, 16);
- return crypto_ablkcipher_encrypt(&req);
+ result->err = err;
+ complete(&result->completion);
}
static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
{
struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
struct crypto_ablkcipher *ctr = ctx->ctr;
- int alignmask = crypto_ablkcipher_alignmask(ctr);
- u8 alignbuf[16+alignmask];
- u8 *hash = (u8 *)ALIGN((unsigned long)alignbuf, alignmask+1);
- int err = 0;
+ struct {
+ be128 hash;
+ u8 iv[8];
+
+ struct crypto_gcm_setkey_result result;
+
+ struct scatterlist sg[1];
+ struct ablkcipher_request req;
+ } *data;
+ int err;
crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
err = crypto_ablkcipher_setkey(ctr, key, keylen);
if (err)
- goto out;
+ return err;
crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
CRYPTO_TFM_RES_MASK);
- err = crypto_gcm_encrypt_counter(aead, hash, -1, NULL);
+ data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
+ GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ init_completion(&data->result.completion);
+ sg_init_one(data->sg, &data->hash, sizeof(data->hash));
+ ablkcipher_request_set_tfm(&data->req, ctr);
+ ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
+ CRYPTO_TFM_REQ_MAY_BACKLOG,
+ crypto_gcm_setkey_done,
+ &data->result);
+ ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
+ sizeof(data->hash), data->iv);
+
+ err = crypto_ablkcipher_encrypt(&data->req);
+ if (err == -EINPROGRESS || err == -EBUSY) {
+ err = wait_for_completion_interruptible(
+ &data->result.completion);
+ if (!err)
+ err = data->result.err;
+ }
+
if (err)
goto out;
if (ctx->gf128 != NULL)
gf128mul_free_4k(ctx->gf128);
- ctx->gf128 = gf128mul_init_4k_lle((be128 *)hash);
+ ctx->gf128 = gf128mul_init_4k_lle(&data->hash);
if (ctx->gf128 == NULL)
err = -ENOMEM;
- out:
+out:
+ kfree(data);
return err;
}
-static int crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
- struct aead_request *req,
- unsigned int cryptlen,
- void (*done)(struct crypto_async_request *,
- int))
+static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
+ unsigned int authsize)
+{
+ switch (authsize) {
+ case 4:
+ case 8:
+ case 12:
+ case 13:
+ case 14:
+ case 15:
+ case 16:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
+ struct aead_request *req,
+ unsigned int cryptlen)
{
struct crypto_aead *aead = crypto_aead_reqtfm(req);
struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
- struct crypto_gcm_req_priv_ctx *pctx = aead_request_ctx(req);
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
u32 flags = req->base.tfm->crt_flags;
- u8 *auth_tag = pctx->auth_tag;
- u8 *counter = pctx->counter;
struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash;
- int err = 0;
+ struct scatterlist *dst;
+ __be32 counter = cpu_to_be32(1);
+
+ memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
+ memcpy(req->iv + 12, &counter, 4);
+
+ sg_init_table(pctx->src, 2);
+ sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
+ scatterwalk_sg_chain(pctx->src, 2, req->src);
+
+ dst = pctx->src;
+ if (req->src != req->dst) {
+ sg_init_table(pctx->dst, 2);
+ sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
+ scatterwalk_sg_chain(pctx->dst, 2, req->dst);
+ dst = pctx->dst;
+ }
ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
- ablkcipher_request_set_callback(ablk_req, aead_request_flags(req),
- done, req);
- ablkcipher_request_set_crypt(ablk_req, req->src, req->dst,
- cryptlen, counter);
-
- err = crypto_gcm_encrypt_counter(aead, auth_tag, 0, req->iv);
- if (err)
- goto out;
-
- memcpy(counter, req->iv, 12);
- crypto_gcm_set_counter(counter, 1);
+ ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
+ cryptlen + sizeof(pctx->auth_tag),
+ req->iv);
crypto_gcm_ghash_init(ghash, flags, ctx->gf128);
crypto_gcm_ghash_update_sg(ghash, req->assoc, req->assoclen);
crypto_gcm_ghash_flush(ghash);
-
- out:
- return err;
}
static int crypto_gcm_hash(struct aead_request *req)
{
struct crypto_aead *aead = crypto_aead_reqtfm(req);
- struct crypto_gcm_req_priv_ctx *pctx = aead_request_ctx(req);
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
u8 *auth_tag = pctx->auth_tag;
struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash;
static int crypto_gcm_encrypt(struct aead_request *req)
{
- struct ablkcipher_request abreq;
- int err = 0;
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+ struct ablkcipher_request *abreq = &pctx->abreq;
+ int err;
+
+ crypto_gcm_init_crypt(abreq, req, req->cryptlen);
+ ablkcipher_request_set_callback(abreq, aead_request_flags(req),
+ crypto_gcm_encrypt_done, req);
- err = crypto_gcm_init_crypt(&abreq, req, req->cryptlen,
- crypto_gcm_encrypt_done);
+ err = crypto_ablkcipher_encrypt(abreq);
if (err)
return err;
- if (req->cryptlen) {
- err = crypto_ablkcipher_encrypt(&abreq);
- if (err)
- return err;
- }
-
return crypto_gcm_hash(req);
}
+static int crypto_gcm_verify(struct aead_request *req)
+{
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+ struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash;
+ u8 *auth_tag = pctx->auth_tag;
+ u8 *iauth_tag = pctx->iauth_tag;
+ unsigned int authsize = crypto_aead_authsize(aead);
+ unsigned int cryptlen = req->cryptlen - authsize;
+
+ crypto_gcm_ghash_final_xor(ghash, req->assoclen, cryptlen, auth_tag);
+
+ authsize = crypto_aead_authsize(aead);
+ scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
+ return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
+}
+
static void crypto_gcm_decrypt_done(struct crypto_async_request *areq, int err)
{
- aead_request_complete(areq->data, err);
+ struct aead_request *req = areq->data;
+
+ if (!err)
+ err = crypto_gcm_verify(req);
+
+ aead_request_complete(req, err);
}
static int crypto_gcm_decrypt(struct aead_request *req)
{
- struct ablkcipher_request abreq;
struct crypto_aead *aead = crypto_aead_reqtfm(req);
- struct crypto_gcm_req_priv_ctx *pctx = aead_request_ctx(req);
- u8 *auth_tag = pctx->auth_tag;
- u8 *iauth_tag = pctx->iauth_tag;
+ struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
+ struct ablkcipher_request *abreq = &pctx->abreq;
struct crypto_gcm_ghash_ctx *ghash = &pctx->ghash;
unsigned int cryptlen = req->cryptlen;
unsigned int authsize = crypto_aead_authsize(aead);
return -EINVAL;
cryptlen -= authsize;
- err = crypto_gcm_init_crypt(&abreq, req, cryptlen,
- crypto_gcm_decrypt_done);
- if (err)
- return err;
+ crypto_gcm_init_crypt(abreq, req, cryptlen);
+ ablkcipher_request_set_callback(abreq, aead_request_flags(req),
+ crypto_gcm_decrypt_done, req);
crypto_gcm_ghash_update_sg(ghash, req->src, cryptlen);
- crypto_gcm_ghash_final_xor(ghash, req->assoclen, cryptlen, auth_tag);
- scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
- if (memcmp(iauth_tag, auth_tag, authsize))
- return -EINVAL;
+ err = crypto_ablkcipher_decrypt(abreq);
+ if (err)
+ return err;
- return crypto_ablkcipher_decrypt(&abreq);
+ return crypto_gcm_verify(req);
}
static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
unsigned long align;
int err;
- ctr = crypto_spawn_ablkcipher(&ictx->ctr);
+ ctr = crypto_spawn_skcipher(&ictx->ctr);
err = PTR_ERR(ctr);
if (IS_ERR(ctr))
return err;
ctx->ctr = ctr;
ctx->gf128 = NULL;
- align = max_t(unsigned long, crypto_ablkcipher_alignmask(ctr),
- __alignof__(u32) - 1);
+ align = crypto_tfm_alg_alignmask(tfm);
align &= ~(crypto_tfm_ctx_alignment() - 1);
- tfm->crt_aead.reqsize = align + sizeof(struct crypto_gcm_req_priv_ctx);
+ tfm->crt_aead.reqsize = align +
+ sizeof(struct crypto_gcm_req_priv_ctx) +
+ crypto_ablkcipher_reqsize(ctr);
return 0;
}
crypto_free_ablkcipher(ctx->ctr);
}
-static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
+static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
+ const char *full_name,
+ const char *ctr_name)
{
+ struct crypto_attr_type *algt;
struct crypto_instance *inst;
struct crypto_alg *ctr;
- struct crypto_alg *cipher;
struct gcm_instance_ctx *ctx;
int err;
- char ctr_name[CRYPTO_MAX_ALG_NAME];
- err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD);
- if (err)
+ algt = crypto_get_attr_type(tb);
+ err = PTR_ERR(algt);
+ if (IS_ERR(algt))
return ERR_PTR(err);
- cipher = crypto_attr_alg(tb[1], CRYPTO_ALG_TYPE_CIPHER,
- CRYPTO_ALG_TYPE_MASK);
+ if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
+ return ERR_PTR(-EINVAL);
- inst = ERR_PTR(PTR_ERR(cipher));
- if (IS_ERR(cipher))
- return inst;
-
- inst = ERR_PTR(ENAMETOOLONG);
- if (snprintf(
- ctr_name, CRYPTO_MAX_ALG_NAME,
- "ctr(%s,0,16,4)", cipher->cra_name) >= CRYPTO_MAX_ALG_NAME)
- return inst;
+ inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
+ if (!inst)
+ return ERR_PTR(-ENOMEM);
- ctr = crypto_alg_mod_lookup(ctr_name, CRYPTO_ALG_TYPE_BLKCIPHER,
- CRYPTO_ALG_TYPE_MASK);
+ ctx = crypto_instance_ctx(inst);
+ crypto_set_skcipher_spawn(&ctx->ctr, inst);
+ err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
+ crypto_requires_sync(algt->type,
+ algt->mask));
+ if (err)
+ goto err_free_inst;
- if (IS_ERR(ctr))
- return ERR_PTR(PTR_ERR(ctr));
+ ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
- if (cipher->cra_blocksize != 16)
+ /* We only support 16-byte blocks. */
+ if (ctr->cra_ablkcipher.ivsize != 16)
goto out_put_ctr;
- inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
- err = -ENOMEM;
- if (!inst)
+ /* Not a stream cipher? */
+ err = -EINVAL;
+ if (ctr->cra_blocksize != 1)
goto out_put_ctr;
err = -ENAMETOOLONG;
- if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
- "gcm(%s)", cipher->cra_name) >= CRYPTO_MAX_ALG_NAME ||
- snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
- "gcm(%s)", cipher->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
- goto err_free_inst;
-
+ if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+ "gcm_base(%s)", ctr->cra_driver_name) >=
+ CRYPTO_MAX_ALG_NAME)
+ goto out_put_ctr;
- ctx = crypto_instance_ctx(inst);
- err = crypto_init_spawn(&ctx->ctr, ctr, inst, CRYPTO_ALG_TYPE_MASK);
- if (err)
- goto err_free_inst;
+ memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
- inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
+ inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
+ inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
inst->alg.cra_priority = ctr->cra_priority;
- inst->alg.cra_blocksize = 16;
- inst->alg.cra_alignmask = __alignof__(u32) - 1;
+ inst->alg.cra_blocksize = 1;
+ inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
inst->alg.cra_type = &crypto_aead_type;
- inst->alg.cra_aead.ivsize = 12;
+ inst->alg.cra_aead.ivsize = 16;
inst->alg.cra_aead.maxauthsize = 16;
inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
inst->alg.cra_init = crypto_gcm_init_tfm;
inst->alg.cra_exit = crypto_gcm_exit_tfm;
inst->alg.cra_aead.setkey = crypto_gcm_setkey;
+ inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
out:
- crypto_mod_put(ctr);
return inst;
+
+out_put_ctr:
+ crypto_drop_skcipher(&ctx->ctr);
err_free_inst:
kfree(inst);
-out_put_ctr:
inst = ERR_PTR(err);
goto out;
}
+static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
+{
+ int err;
+ const char *cipher_name;
+ char ctr_name[CRYPTO_MAX_ALG_NAME];
+ char full_name[CRYPTO_MAX_ALG_NAME];
+
+ cipher_name = crypto_attr_alg_name(tb[1]);
+ err = PTR_ERR(cipher_name);
+ if (IS_ERR(cipher_name))
+ return ERR_PTR(err);
+
+ if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
+ CRYPTO_MAX_ALG_NAME)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
+ CRYPTO_MAX_ALG_NAME)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ return crypto_gcm_alloc_common(tb, full_name, ctr_name);
+}
+
static void crypto_gcm_free(struct crypto_instance *inst)
{
struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
- crypto_drop_spawn(&ctx->ctr);
+ crypto_drop_skcipher(&ctx->ctr);
kfree(inst);
}
.module = THIS_MODULE,
};
+static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
+{
+ int err;
+ const char *ctr_name;
+ char full_name[CRYPTO_MAX_ALG_NAME];
+
+ ctr_name = crypto_attr_alg_name(tb[1]);
+ err = PTR_ERR(ctr_name);
+ if (IS_ERR(ctr_name))
+ return ERR_PTR(err);
+
+ if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s)",
+ ctr_name) >= CRYPTO_MAX_ALG_NAME)
+ return ERR_PTR(-ENAMETOOLONG);
+
+ return crypto_gcm_alloc_common(tb, full_name, ctr_name);
+}
+
+static struct crypto_template crypto_gcm_base_tmpl = {
+ .name = "gcm_base",
+ .alloc = crypto_gcm_base_alloc,
+ .free = crypto_gcm_free,
+ .module = THIS_MODULE,
+};
+
+static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
+ unsigned int keylen)
+{
+ struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
+ struct crypto_aead *child = ctx->child;
+ int err;
+
+ if (keylen < 4)
+ return -EINVAL;
+
+ keylen -= 4;
+ memcpy(ctx->nonce, key + keylen, 4);
+
+ crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
+ crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
+ CRYPTO_TFM_REQ_MASK);
+ err = crypto_aead_setkey(child, key, keylen);
+ crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
+ CRYPTO_TFM_RES_MASK);
+
+ return err;
+}
+
+static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
+ unsigned int authsize)
+{
+ struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
+
+ switch (authsize) {
+ case 8:
+ case 12:
+ case 16:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return crypto_aead_setauthsize(ctx->child, authsize);
+}
+
+static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
+{
+ struct aead_request *subreq = aead_request_ctx(req);
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
+ struct crypto_aead *child = ctx->child;
+ u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
+ crypto_aead_alignmask(child) + 1);
+
+ memcpy(iv, ctx->nonce, 4);
+ memcpy(iv + 4, req->iv, 8);
+
+ aead_request_set_tfm(subreq, child);
+ aead_request_set_callback(subreq, req->base.flags, req->base.complete,
+ req->base.data);
+ aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
+ aead_request_set_assoc(subreq, req->assoc, req->assoclen);
+
+ return subreq;
+}
+
+static int crypto_rfc4106_encrypt(struct aead_request *req)
+{
+ req = crypto_rfc4106_crypt(req);
+
+ return crypto_aead_encrypt(req);
+}
+
+static int crypto_rfc4106_decrypt(struct aead_request *req)
+{
+ req = crypto_rfc4106_crypt(req);
+
+ return crypto_aead_decrypt(req);
+}
+
+static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
+{
+ struct crypto_instance *inst = (void *)tfm->__crt_alg;
+ struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
+ struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
+ struct crypto_aead *aead;
+ unsigned long align;
+
+ aead = crypto_spawn_aead(spawn);
+ if (IS_ERR(aead))
+ return PTR_ERR(aead);
+
+ ctx->child = aead;
+
+ align = crypto_aead_alignmask(aead);
+ align &= ~(crypto_tfm_ctx_alignment() - 1);
+ tfm->crt_aead.reqsize = sizeof(struct aead_request) +
+ ALIGN(crypto_aead_reqsize(aead),
+ crypto_tfm_ctx_alignment()) +
+ align + 16;
+
+ return 0;
+}
+
+static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
+{
+ struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
+
+ crypto_free_aead(ctx->child);
+}
+
+static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
+{
+ struct crypto_attr_type *algt;
+ struct crypto_instance *inst;
+ struct crypto_aead_spawn *spawn;
+ struct crypto_alg *alg;
+ const char *ccm_name;
+ int err;
+
+ algt = crypto_get_attr_type(tb);
+ err = PTR_ERR(algt);
+ if (IS_ERR(algt))
+ return ERR_PTR(err);
+
+ if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
+ return ERR_PTR(-EINVAL);
+
+ ccm_name = crypto_attr_alg_name(tb[1]);
+ err = PTR_ERR(ccm_name);
+ if (IS_ERR(ccm_name))
+ return ERR_PTR(err);
+
+ inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
+ if (!inst)
+ return ERR_PTR(-ENOMEM);
+
+ spawn = crypto_instance_ctx(inst);
+ crypto_set_aead_spawn(spawn, inst);
+ err = crypto_grab_aead(spawn, ccm_name, 0,
+ crypto_requires_sync(algt->type, algt->mask));
+ if (err)
+ goto out_free_inst;
+
+ alg = crypto_aead_spawn_alg(spawn);
+
+ err = -EINVAL;
+
+ /* We only support 16-byte blocks. */
+ if (alg->cra_aead.ivsize != 16)
+ goto out_drop_alg;
+
+ /* Not a stream cipher? */
+ if (alg->cra_blocksize != 1)
+ goto out_drop_alg;
+
+ err = -ENAMETOOLONG;
+ if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
+ "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
+ snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
+ "rfc4106(%s)", alg->cra_driver_name) >=
+ CRYPTO_MAX_ALG_NAME)
+ goto out_drop_alg;
+
+ inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
+ inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
+ inst->alg.cra_priority = alg->cra_priority;
+ inst->alg.cra_blocksize = 1;
+ inst->alg.cra_alignmask = alg->cra_alignmask;
+ inst->alg.cra_type = &crypto_nivaead_type;
+
+ inst->alg.cra_aead.ivsize = 8;
+ inst->alg.cra_aead.maxauthsize = 16;
+
+ inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
+
+ inst->alg.cra_init = crypto_rfc4106_init_tfm;
+ inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
+
+ inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
+ inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
+ inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
+ inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
+
+ inst->alg.cra_aead.geniv = "seqiv";
+
+out:
+ return inst;
+
+out_drop_alg:
+ crypto_drop_aead(spawn);
+out_free_inst:
+ kfree(inst);
+ inst = ERR_PTR(err);
+ goto out;
+}
+
+static void crypto_rfc4106_free(struct crypto_instance *inst)
+{
+ crypto_drop_spawn(crypto_instance_ctx(inst));
+ kfree(inst);
+}
+
+static struct crypto_template crypto_rfc4106_tmpl = {
+ .name = "rfc4106",
+ .alloc = crypto_rfc4106_alloc,
+ .free = crypto_rfc4106_free,
+ .module = THIS_MODULE,
+};
+
static int __init crypto_gcm_module_init(void)
{
- return crypto_register_template(&crypto_gcm_tmpl);
+ int err;
+
+ err = crypto_register_template(&crypto_gcm_base_tmpl);
+ if (err)
+ goto out;
+
+ err = crypto_register_template(&crypto_gcm_tmpl);
+ if (err)
+ goto out_undo_base;
+
+ err = crypto_register_template(&crypto_rfc4106_tmpl);
+ if (err)
+ goto out_undo_gcm;
+
+out:
+ return err;
+
+out_undo_gcm:
+ crypto_unregister_template(&crypto_gcm_tmpl);
+out_undo_base:
+ crypto_unregister_template(&crypto_gcm_base_tmpl);
+ goto out;
}
static void __exit crypto_gcm_module_exit(void)
{
+ crypto_unregister_template(&crypto_rfc4106_tmpl);
crypto_unregister_template(&crypto_gcm_tmpl);
+ crypto_unregister_template(&crypto_gcm_base_tmpl);
}
module_init(crypto_gcm_module_init);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Galois/Counter Mode");
MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
+MODULE_ALIAS("gcm_base");
+MODULE_ALIAS("rfc4106");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff